<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <title>图书管理系统</title>
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/css/bootstrap.min.css" rel="stylesheet">
    <style>
        body {
            min-height: 100vh;
            background: linear-gradient(120deg, #f8fafc 0%, #e0e7ff 100%);
            font-family: 'Segoe UI', 'Microsoft YaHei', Arial, sans-serif;
        }
        h1, h2, h3, h4, h5 {
            font-weight: 700;
        }
        .card {
            box-shadow: 0 2px 8px #e0e0e0;
        }
    </style>
</head>
<body>
    <div class="container py-4">
        {% block content %}{% endblock %}
    </div>
</body>
</html> 